Sewing-machine shuttle.



H. A. BATES.

SEWING MACHINE SHUTTLE.

APPLIGATIOX rum: nu 2' ma.

908,833. Patented Jan. 5, 1909.

HENRY A. BATES, MIDDLETOWN, CONNECTICUT.

SEWING-MACHINE SHUTTLE.

Specification of Letters Patent.

Application filed Kay 27, 1908. Serial No. 435,185.

Patented Jan. 5., 1909 Be it known that I, HEXRY A. Barns. a citizen of the United States, residing at Middletown, in the county of Middlesex and State of Connecticut, have invented an Iniprovement'in Sewing-Machine Shuttles, of l which the following is a-speciiication.

My invention relates particularly to the tension or holding spring of the thread bobbin, and the same is an improvement u on g the devices of patents heretofore grante to l me in this art. l

In the device of my present invention 1 l preferably employ a form of sewing machine shuttle in which there is a pivoted lever secured to a slotted tubular pin-ot the bobbin I case holder or shell over which the bobbin l T 0 all whom it may concern: i l l connect these parts. With this device. .s been diliicult to separate the arts and J- ticularly to remove the threat bobbin 1, in the bobbin case after the latter has been slipped over the lever; ordinary springs not having sutlicient resiliency and movemen to assist, in this separation. In the device of my invention and in combination with this bobbin case holder or; shell and a separable bobbin case and thread bobbin, I emplov a volute spring adapted to be received within the bobbin case andseated against the inner angular corner thereof. The sprin is coiled for compression-in the direction of the axis of the bobbin case. Its convolutions are therefore adapted to be brought into the same lane or substantially so by introduction into the bobbin case of the thread bobbin; the resiliency of the spring still being fully 1 effective the moment the connecting pressure of the lever is removed,-the action being not only to se arate the bobbin case from the bobbin case older but the thread bobbin t from the bobbin case.

In the drawing Figure 1 is a sewing machine shuttle such as prefer to employ. Fig. 2 is a plan of the bobbin case holder or .shell; the bobbin case being rc-i moved and the pivoted lever turned up into I the axial line of the tubular pin. Fig. 3 is a plan of the bobbin case with the spring of my improvement Without the thread mbbin and as turned directly over from its relation with the bobbin case holder as shown in Fig. 2. 1 Fig. 4 is a cross section on the dotted line 2-, .r, of Fig. 1 showing the trunverse section of the parts shown in Figs. 1 to 3 inclusive and also lan of the 5 of the thread bobbin. Fig. 5 is a vertical cross section on the dotted line y, y. of Fig. 3 through the bobbin case and its spring alone.

'lhe bobbin case holder or shell (1 comprises a disk with a flange that is narrow in part and wide in part with a book a and a central tubular pin' a slotted along one side;

i the said pin being longer than the thickness of the bobbin case c.

In the outer end of the tubniar pin a a le ver b is pivotally connected by the pin 2 and within this tubular pin is a plunger 4 and a spring 3 between the under side of the head of the plunger and the inner'surlace of the bobbin case holder (1; the functi n of the sprin Dlungor being to maintain the lever B i in either one of its two positions. that is'to i say,the inner end of the lever bead where-1t ,case 15 passed, and this lever turns dow .o

is pivoted to the tubular pin is beveled in o posite directions so that when one face of t e bevel comes against the list fare of the plunger the lever is hold down against. the bobbin case as shown in Fig. 4. It upon the other hand this lever is pulled outward into an axial line with the tubular pin a the other. inclined face comes to a beaiin upon the outer surface of the plunger an it is then held in line to the tubular pin so that the bobbin case and thread bobbin may be slipped on or bti of the tubular pin into its operative position or separate therefrom.

The bobbin case cis a shell cop-shaped, and is provided with a central 0 ening c to receive the [rec end of the tubu or pin a? which passes therethrough. This bobbin case is 5 preferably provided with a thread tension 3 device e of usual construction and f represents the thread-bobbin received within the bobbin case which it closely tits; the opening in the thread bobbin being concentrlc with l the opening in the bobbin case.

The ossvntial feature of my invention resides in the voiute spring d having a large base convolution 5 and a small top convolution 6, and as will be seen from Fig. 5 this spring when free tills more than half the depth or thickness of the bobbin case. it is coiled lot coin )ression in the direction of the axis of the bobbin case so that itwould lie down in a lane parallel with the plane of the base of t re bobbin case or substantially against the inner tlat surface of the bobbin case without its resilient-y being affected. It

i is removable and is t'riotionally held by the large base. convolution being pressed into the inner corner or angle of the bobbin case. The thread bOlJblDf M5 the bobbin case comparatively freely and yet sufficiently closely sion in the direction of the axis of the bobbin or it to maintain its concentricity therewith. case received in the bobbin case between the When the thread bobbin is placed into thel same and the thread bobbin and acting exbobbin case this volute spring is put under l pansively upon the release of said means' to tension and brought into an almost flattened i separate said parts.

condition; especially is this the case when the 3. The combination with a bobbin case tubular in of the bobbin case holder is holder, a tubular slotted pin formed therepassed t rough the thread bobbin and with and a lever pivoted in the open free end through the open center 6 of the bobbin case. of the tubular in, of a bobbin case having an In this position and when the lever b is 1 open center a aptcd to be passed over said turned over as shown in Fig. 4, the parts are lever and tubular pin, and said parts held tocon'nected in a removable relation, but this ether by the operation of said lever, a thread connected relation cannot be chan ed exbobbin received within the bobbin case and a cept by normall swinging the lever volute spring also received within the bobbin 4 shows the v0 ute spring d under tension case and between the same and the thread and with the convolutions in substantially a bobbin and acting expansively upon the reilat horizontal plane. 'lhe moment the lelease of said means to separate said parts. ver 5 is turned from the full line position Fig. 4. The combination with a bobbin case 4 into the dotted position lcig. 4 the bobbin holder, a tubular slotted pin formed therecase and thread bobbin are released. The with and a lever pivoted in the open free end power of the spring 11 is then at once nianiof the tubular pin, of a bobbin case having an fest, causing the separation or dissssociation open center adapted to be passed over said from their operative position of the bobbin lever and tubular pin and said parts held tocase from the thread bobbin and from the gethcr by the operation of saidlever,atliread bobbin case holder so that the continuation of the act of separating the parts can be arolute spring coiled for compression in the readily and easily performed manually. By direction of the axis of the bobbin case also means of thisvolnte spring an even tension received within the bobbin case and between is applied to the tin-winding thread of the the same and the thread bobbin and acting bobbin and tins tension is permanent beexpansivcly upon the release of said means to cause of the liberal proportions of the volute separate said parts. springd and the further fact that the same is 5. '1 he combination with a bobbin case not at all liable to be in'ured in use. The holder, a bobbin case and thread bobbin reoverlapoed central convolution of the voiute 1 ccived thereby and means for' connecting spring shown at 6 provides a convenient scat said parts, of a volute spring received in the for the thread bobbin at one side. bobbin case between the same and the thread I claim as my invention: bobbin and acting upon the thread bobbin to 1. 'l he combination with a bobbin case prevent a too free unwinding or loosening of holder, n bobbin case and thread bobbin rethe thread when the parts are connected, and

ceived thereby and means for connecting also acting cxpansivcly upon the release of said parts, of a volute spring received in the said connecting means to separate the bobbobbin case between the same and the thread bin case from the remaining parts. pobbinf and1 acting expansively upon the rc- Signed by me this 21st day of May 1908.

case 0 sai means to se aratc said arts. Y r s 2. The combination \i ith a bobliin case HER R1 BATkb' holder, a bobbin case and thread bobbin received thereby and means for connecting said parts, of a volute spring coiled for compres- Witnesses:

Geo. T. PINCKNEY,

Zacnanmsnn.

bobbin received within the bobbin case, and 

